Rotary trip tong



Nov. 30 1926.

S. C. WlNFREY ROTARY TRI P TONG Filed August 24 IWW..

ffm@ T12@ Patented Nov. 30, 1926.

UNITED STATES PATENT OFFICE.

SADIE C. WINFREY, 0F NOBPHLEAT, ARKANSAS.

ROTARY TRIP TQNG.

Application led August 24, 1925. Serial No. d52,168.

This invention relates to new and useful imrovements in a rotary triptong.

ne objectof the invention is to provlde a tong of the characterdescribed adapted to be applied to a drill stem oi; other tu in a wellbo're, and to be operated by the rotary table, and which `is soconstructed that it will transmit only a predetermined `torsional strainto the stem, or tubing, and thus protect the tong against breakage andthe stem, or tubing, and coupling connecting the sections thereofagainst crushing or bursting. n

With the above and other objects in view this invention has particularrelation to certain novel features of construction, operation, andarrangement of parts, an example of which is given in this specificationand illustrated in the accompanying drawings, wherein Figure 1 shows afragmentary plan view of a rotary table, showing the tong applied to thepipe and in operative connection with the table, and

Figure 2 ,shows a frontelevation of tong.

Referring now more particularly to the drawings, wherein like numeralsof reference designate similar parts in each of the i ures, the numeral1 designates the rotary tale, and the numeral 2 designates thedrillstem, or other pipe, which extends through the central opening of thetable and down 4into a well bore.

The tong 'includes a handle, which is formed of the sections 3, and 4,'ointed togather. free end of the section 4 are the serrated,

ipe engaging jaws 5, 5. A chain 6 is astened, at one end, to the frontside of the the handle, adjacent said jaws,- and this, chain is adaptedto be passed around the pipe, and

ybetween the jaws, and its other end may be secured to the hook 7carried 'by vthe back side of the handle.

Bearings 8, 8 are secured to the front side of the handle, on oppositesides o f the joint thereof, and a jointed rod formed ofthe sections 9,9 works through said beLrings. The ends of this rod are threaded andreceive the nuts 10, 10 and inter osed between these nuts and therespective ear-ings 8, 8, and surrounding said rod are the strong coilsprings 11, 11.

Secured to opposite si es of the The joints of the handle and ,rod arealigned and are one way joints, being formed to break backwardly only.

In application the tong is applied to the cannot be broken by theapplication of atorsional stra'n which the tong, or pipe will stand thesprings 11, 11, will yield to permit the joints' connecting the handlesections 3. and 4 and the rod sections 9, 9, to

.break and the back up post 12 to pass, thus preventing the breakage ofthe tong and the bursting of the connecting coupling or the crushing ofthe pipe.

When the back up post has passed the pressure of said springs willimmediately restore the tong to operative position so that upon thecompletion of each rotation of the table the back up post will againengage the tong and subject the pipe to another torsional strain, .andso onv until the joint is broken.

What vI claim is 1. A tong including a handle formed of sections jointedtogether, bearings carried by the handle, one on each side of the handlejoint, a jointed rod working through said bearings, abutments on saidrod, one on each side of the joint thereof, yieldable members interposedbetween the respective bearings and the corresponding abutments.

2. A tong including a handle formed of sections jointed together,hearings carried by the handle, one on each side oi' the handle 'oint, ajointed rod working through said earings, abutments on said rod, one oneach side of the joint thereof, yieldable members interposed between therespective bearings and the corresponding abutments and pipe engagingmeans carried by the handle.

In testimony whereof I have signed my name'to this specification.

SADIE c. WINFREY.

pipe, in the usual Way. The-conventional

